Before testing the control, unplug the refrigerator
to avoid an electrical shock hazard.
Most refrigerator-freezers have a control that
adjusts the operation of the cooling system of the freezer only.
In such appliances, any control for the refrigerator is simply a
mechanical system of opening or closing vents between the refrigerator
and freezer to let in more or less cold air.
Remove the temperature control dial or housing.
Pull the dial straight away from the wall. Remove the temperature
control. If there is a housing, it either snaps into place
or is held in place with screws. Remove the screws, or gently
depress the retaining clips with a small screwdriver. Allow
the housing to hang by its wiring.
Before testing the control, unplug the refrigerator
to avoid an electrical shock hazard. 
